public function actionActiveRecord()
 {
     $countryExists = Country::find()->where(['code' => 'PR'])->exists();
     if (!$countryExists) {
         $model = new Country();
         $model->name = 'Pery';
         $model->code = 'PR';
         if (!$model->save()) {
             var_dump($model->getErrors());
             return "Model not saved";
         }
     }
     $country = Country::findOne('UA');
     $countries = Country::findAll(['UA', 'GB']);
     $searchModel = new CountrySearch();
     $dataProvider = $searchModel->search(Yii::$app->request->queryParams);
     return $this->render('index', ['searchModel' => $searchModel, 'dataProvider' => $dataProvider]);
 }